Magnetic polaron and antiferromagnetic-ferromagnetic transition in doped bilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CrI</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
David Soriano, M. I. Katsnelson
Abstract
Recent experiments have proven that few-layer CrI${}_{3}$, a two-dimensional ferromagnetic insulator, orders antiferromagnetically between layers and shows very small critical fields, which allows for full electrical control of interlayer magnetism. Here, the authors propose a switching mechanism based on the formation of magnetic polarons, or ferrons. Electrons in bilayer CrI${}_{3}$ become self-trapped, forming ferromagnetic droplets in an antiferromagnetic insulating matrix. If the concentration of electrons is high enough, the system becomes ferromagnetic. For holes, the self-trapping never occurs.
Topics & Concepts
AntiferromagnetismFerromagnetismPolaronCondensed matter physicsDopingvan der Waals forceBilayerMaterials sciencePhysicsElectronChemistryQuantum mechanicsMoleculeBiochemistryMembrane2D Materials and ApplicationsPerovskite Materials and ApplicationsAdvanced Memory and Neural Computing